HP C2246 Technical Reference Manual page 111

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Test Unit Ready
Test Unit Ready
The TEST UNIT READY command provides a means to check if the logical unit is ready.
This is not a request for a self test. If the logical unit is up to speed and ready for media
access, this command will return a GOOD status. This does not assure that media access will
be successful. If the drive is not up to speed, this command will
return a status of
CHECK
CONDITION. A REQUEST SENSE command will return a Sense Key of NOT READY and
an Additional Sense Code of DRIVE NOT READY.
Test Unit Ready Command Descriptor Block (COB)
Bit
Byte
7
I
6
I
5
I
4
I·
3
I
2
I
1
I
0
00
Opcode= OOH
01 Logical Unit Number
I
Reserved
02-04
Reserved
05 Control Byte
SCSI Command Descriptions A·55